This is
a chapter from the 77 Buick Chassis service manual, but most of it applies
equally to THM350's from other divisions. The main difference is that
Buick-Olds-Pontiac uses one bolt
pattern on the bell housing, while Chev uses another.

The idea is to scan manuals for old, vintage or antique American vehicles
and their components and make them available on the web, for free.

Why
are we doing this?
Why not? But really - one of the hardest parts of restoring or servicing
old machines is getting decent technical information. Often, it's difficult,
impossible or expensive to obtain. We think that this kind of information
should be freely available, as a public resource for the preservation
of our industrial history.